Datasheet > SE5230DG

SE5230DG

更新时间： 2024-02-12 15:58:31

品牌	Logo	应用领域
安森美 - ONSEMI		/
页数	文件大小	规格书
18页	211K
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Low Voltage Operational Amplifier

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SE5230DG 数据手册

NE5230, SA5230, SE5230

THEORY OF OPERATION

Input Stage

voltage moves from the range where only the NPN pair was

operating to where both of the input pairs were operating, the

effective transconductance would change by a factor of two.

Frequency compensation for the ranges where one input pair

was operating would, of course, not be optimal for the range

where both pairs were operating. Secondly, fast changes in

the common−mode voltage would abruptly saturate and

restore the emitter current sources, causing transient

distortion. These problems were overcome by assuring that

only the input transistor pair which is able to function

properly is active. The NPN pair is normally activated by the

Operational amplifiers which are able to function at

minimum supply voltages should have input and output

stage swings capable of reaching both supply voltages

within a few millivolts in order to achieve ease of quiescent

biasing and to have maximum input/output signal handling

capability. The input stage of the NE5230 has a

common−mode voltage range that not only includes the

entire supply voltage range, but also allows either supply to

be exceeded by 250 mV without increasing the input offset

voltage by more than 6.0 mV. This is unequalled by any

other operational amplifier today.

current source I through Q5 and the current mirror Q6 and

In order to accomplish the feat of rail−to−rail input

common−mode range, two emitter−coupled differential

pairs are placed in parallel so that the common−mode

voltage of one can reach the positive supply rail and the other

can reach the negative supply rail. The simplified schematic

of Figure 1 shows how the complementary emitter−coupler

transistors are configured to form the basic input stage cell.

Common−mode input signal voltages in the range from

0.8 V above V to V are handled completely by the NPN

Q7, assuming the PNP pair is non−conducting. When the

common−mode input voltage passes below the reference

voltage, V − 0.8 V at the base of Q5, the emitter current is

gradually steered toward the PNP pair, away from the NPN

pair. The transfer of the emitter currents between the

complementary input pairs occurs in a voltage range of

about 120 mV around the reference voltage V . In this way

the sum of the emitter currents for each of the NPN and PNP

transistor pairs is kept constant; this ensures that the

transconductance of the parallel combination will be

constant, since the transconductance of bipolar transistors is

proportional to their emitter currents.

An essential requirement of this kind of input stage is to

minimize the changes in input offset voltage between that of

the NPN and PNP transistor pair which occurs when the

input common−mode voltage crosses the internal reference

pair, Q3 and Q4, while common−mode input signal voltages

in the range of V to 0.8 V above V are processed only

by the PNP pair, Q1 and Q2. The intermediate range of input

voltages requires that both the NPN and PNP pairs are

operating. The collector currents of the input transistors are

summed by the current combiner circuit composed of

transistors Q8 through Q11 into one output current.

Transistor Q8 is connected as a diode to ensure that the

outputs of Q2 and Q4 are properly subtracted from those of

Q1 and Q3.

voltage, V . Careful circuit layout with a cross−coupled

quad for each input pair has yielded a typical input offset

voltage of less than 0.3 mV and a change in the input offset

voltage of less than 0.1 mV.

The input stage was designed to overcome two important

problems for rail−to−rail capability. As the common−mode

R11

R10

Q11

Q10

IN−

IN+

OUT

Figure 1. Input Stage

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中文翻译

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SE5230DG 替代型号

型号	品牌	替代类型	描述	数据表
NE5230DR2G	ONSEMI	完全替代	Low Voltage Operational Amplifier
SA5230D	ONSEMI	完全替代	Low Voltage Operational Amplifier
SE5230D	ONSEMI	完全替代	Low Voltage Operational Amplifier

与SE5230DG相关器件

型号	品牌	获取价格	描述	数据表
SE5230DR2	ONSEMI	获取价格	Low Voltage Operational Amplifier
SE5230DR2G	ONSEMI	获取价格	Low Voltage Operational Amplifier
SE526A	NXP	获取价格	Comparator, 1 Func, 5000uV Offset-Max, BIPolar, PDIP14
SE526K	NXP	获取价格	Comparator, 1 Func, 5000uV Offset-Max, BIPolar, MBCY10
SE527A	NXP	获取价格	IC COMPARATOR, 6000 uV OFFSET-MAX, PDIP14, Comparator
SE527F	NXP	获取价格	IC COMPARATOR, 6000 uV OFFSET-MAX, CDIP14, CERDIP-14, Comparator
SE527F/883B	PHILIPS	获取价格	Comparator, 1 Func, BIPolar, CDIP14,
SE527F/883C	PHILIPS	获取价格	Comparator, 1 Func, BIPolar, CDIP14,
SE527F883B	NXP	获取价格	IC COMPARATOR, 6000 uV OFFSET-MAX, CDIP14, CERDIP-14, Comparator
SE527F-A	PHILIPS	获取价格	Comparator, 1 Func, BIPolar, CDIP14,

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